From: Thierry Volpiatto <thievol@posteo.net>
To: Juri Linkov <juri@linkov.net>
Cc: Lars Ingebrigtsen <larsi@gnus.org>,
Stefan Monnier <monnier@iro.umontreal.ca>,
emacs-devel@gnu.org
Subject: Re: Improve `replace-regexp-in-string' ergonomics?
Date: Wed, 13 Oct 2021 08:41:10 +0000 [thread overview]
Message-ID: <87y26xe1ni.fsf@posteo.net> (raw)
In-Reply-To: <8735p5z79i.fsf@mail.linkov.net>
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Juri Linkov <juri@linkov.net> writes:
>>> What does the following return?
>>>
>>> (let ((bar "bar"))
>>> (helm-aand bar
>>> (replace-regexp-in-string "b" "f" it)
>>> (replace-regexp-in-string "f" "o" it)))
>>>
>>> If it returns "oar" then it applies replacements sequentially,
>>> and we have no problem with such implementations.
>>
>> Yes, it does, thought you wanted something easy to read (and write), it
>> was the initial question isn't it?
>
> General-purpose threading like you proposed is a nice feature.
> But is supports only sequential replacements.
>
>>> But we need an alternative version that performs simultaneous
>>> replacements and returns "far".
>>
>> So I don't understand what you want to achieve.
>
> Most of replacements are intended to be simultaneous.
> But in practice most of simultaneous replacements
> could be performed using sequential replacement
> because often the result of every replacement step
> doesn't contain matches for the next replacement step.
>
> But sometimes simultaneous replacement is required.
> For example,
>
> (let ((bar "<&"))
> (helm-aand bar
> (replace-regexp-in-string "<" "<" it)
> (replace-regexp-in-string "&" "&" it)))
>
> will do the wrong thing (and will return "&lt;&" instead of the
> intended "<&") because these replacements should be performed
> simultaneously.
I see what you mean now, thanks for explanations.
--
Thierry
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prev parent reply other threads:[~2021-10-13 8:41 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-22 4:36 Improve `replace-regexp-in-string' ergonomics? Lars Ingebrigtsen
2021-09-22 5:22 ` Yuri Khan
2021-09-22 6:36 ` Lars Ingebrigtsen
2021-09-22 7:47 ` Thierry Volpiatto
2021-09-22 5:24 ` Po Lu
2021-09-22 6:37 ` Lars Ingebrigtsen
2021-09-22 10:56 ` Po Lu
2021-09-22 20:08 ` Lars Ingebrigtsen
2021-09-23 0:11 ` Po Lu
2021-09-22 7:33 ` Adam Porter
2021-09-22 8:09 ` Lars Ingebrigtsen
2021-09-22 7:51 ` Andreas Schwab
2021-09-22 8:14 ` Augusto Stoffel
2021-09-22 8:21 ` Adam Porter
2021-09-22 18:01 ` Stefan Monnier
2021-09-22 18:24 ` Basil L. Contovounesios
2021-09-22 22:56 ` Adam Porter
2021-09-22 23:53 ` Eric Abrahamsen
2021-09-22 20:06 ` Lars Ingebrigtsen
2021-09-22 10:59 ` Dmitry Gutov
2021-09-22 20:18 ` Lars Ingebrigtsen
2021-09-22 22:23 ` Dmitry Gutov
2021-09-22 23:24 ` [External] : " Drew Adams
2021-09-22 18:14 ` Stefan Monnier
2021-09-22 19:30 ` Mattias Engdegård
2021-09-22 20:22 ` Lars Ingebrigtsen
2021-09-22 20:29 ` Lars Ingebrigtsen
2021-09-23 2:15 ` Stefan Monnier
2021-10-05 16:18 ` Juri Linkov
2021-10-12 6:53 ` Juri Linkov
2021-10-12 12:10 ` Lars Ingebrigtsen
2021-10-12 12:34 ` Stefan Monnier
2021-10-12 12:41 ` Lars Ingebrigtsen
2021-10-12 13:18 ` Lars Ingebrigtsen
2021-10-12 13:32 ` Mattias Engdegård
2021-10-12 15:48 ` Stefan Monnier
2021-10-12 13:33 ` Thierry Volpiatto
2021-10-12 19:16 ` Juri Linkov
2021-10-12 20:44 ` Thierry Volpiatto
2021-10-13 7:57 ` Juri Linkov
2021-10-13 8:41 ` Thierry Volpiatto [this message]
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